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  <title>返回指定对象的hash id</title>
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 <body class="docs"><div id="layout">
  <div id="layout-content"><div id="function.spl-object-hash" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">spl_object_hash</h1>
  <p class="verinfo">(PHP 5 &gt;= 5.2.0, PHP 7)</p><p class="refpurpose"><span class="refname">spl_object_hash</span> &mdash; <span class="dc-title">
   返回指定对象的hash id
  </span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.spl-object-hash-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>spl_object_hash</strong></span>
    ( <span class="methodparam"><span class="type">object</span> <code class="parameter">$obj</code></span>
   ) : <span class="type">string</span></div>

  <p class="para rdfs-comment">
   本函数为指定对象返回一个唯一标识符。这个标识符可用于作为保存对象或区分不同对象的hash key。
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.spl-object-hash-parameters">
   <h3 class="title">参数</h3>
   <p class="para">
    <dl>

     
      <dt>
<code class="parameter">object</code></dt>

      <dd>

       <p class="para">
        Any object. 
       </p>
      </dd>

     
    </dl>

   </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.spl-object-hash-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   字符串，对于每个对象它都是唯一的，并且对同一个对象它总是相同。
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-function.spl-object-hash-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="regexiterator.setpregflags.example.basic">
    <p><strong>Example #1 A <span class="function"><strong>spl_object_hash()</strong></span> example</strong></p>
    <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$id&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">spl_object_hash</span><span style="color: #007700">(</span><span style="color: #0000BB">$object</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$storage</span><span style="color: #007700">[</span><span style="color: #0000BB">$id</span><span style="color: #007700">]&nbsp;=&nbsp;</span><span style="color: #0000BB">$object</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
    </div>

   </div>
  </p>
 </div>


 <div class="refsect1 notes" id="refsect1-function.spl-object-hash-notes">
  <h3 class="title">注释</h3>
  <blockquote class="note"><p><strong class="note">Note</strong>: 
   <p class="para">
    When an object is destroyed, its hash may be reused for other objects.
   </p>
  </p></blockquote>
 </div>
 

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